<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>移动端</title>
    <style>
        .bg{
            display: flex;
            /* flex-direction: column; */
            /* justify-content: space-evenly; */
            justify-content: space-between;
            width: 80%;
            height: 100px;
            border: 1px solid #000;
        }
        div div{
            width: 80px;
            height: 80px;
            background: blanchedalmond;
        }
    </style>
</head>
<body>
    <div class="bg">
        <div>1</div>
        <div>2</div>
        <div>3</div>
    </div>
</body>
</html>